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• The moment of FeCo thin films decreases after oxidation. • Temperature is the dominant factor in the FeCo thin film oxidation. • The mechanism of the moment loss is due to the formation of ferrimagnetic oxide and the change of Fe/Co ratio in the remaining FeCo layer. • Co does not take part in the FeCo oxidation process. FeCo (60%-70% Fe, 30%-40% Co at.%) alloys have been used as write transducer materials due to their large saturation magnetization at room temperature (μ 0 M = 2.45 T). In this research, we investigate the influence of oxidation on the magnetic moment of a Fe 70 Co 30 material at elevated temperatures in the application of heat assisted magnetic recording. We find that the moment of Fe 70 Co 30 decreases after oxidation for all temperatures explored and that Co does not take part in the oxidation process. The moment loss is mainly due to the formation of ferrimagnetic Fe 3 O 4 or γ-Fe 2 O 3 as well as the change of the Fe/Co ratio in the FeCo alloy. A 2 nm Cr underlayer has been employed to change the FeCo texture from (1 1 0) to (0 0 2). This also increases the grain size of the FeCo thin film. In the case of the (0 0 2) textured sample, voids form between the FeCo film and the oxide layer, which could be the direct result of Fe cations diffusion. [ABSTRACT FROM AUTHOR]